KR200318731Y1 - Combined paper sack - Google Patents

Abstract

The present invention is about rent.

The present invention is a zone of the structure using the core core as the zone material. The fabric used in the present invention zone is made of core. The zone of the present invention is prepared by using a corrugated core and / or a multi-core corrugated paper treated with kraft paper by mixing 30% by weight or more of pulp made of long fibers.

Description

Multiple Corrugated Zones {Combined paper sack}

The present invention is directed to multiple corrugated zones. In particular, the present invention relates to a zone of new construction made using corrugated medium paper and / or multiple corrugated wicks.

Heavy-packaging zones such as cement, sugar, milling, feed, etc. are manufactured by superimposing three or four layers of paper of high strength such as kraft paper. Normally, the land for land uses kraft paper made from 100% by weight of virgin pulp as a raw material, but in countries such as Korea, where wood resources are scarce, kraft paper made by mixing 20% by weight of long fiber paper into virgin pulp is used. Sometimes. However, the manufacture of paper zones presents many challenges due to the increase in the amount of paper used worldwide and the decrease in the production of wood as a pulp resource.

Moreover, in recent years, as the price of pulp, a raw material for kraft paper, has risen, efforts have been made to reduce the cost and insert heat-sealed synthetic resin films between kraft paper and kraft paper (Utility Model Registration Publication No. 1985-1644). ), Or a laminated paper (Utility Model Registration Publication No. 1996-7485) laminated with polyethylene film on kraft paper has been developed. However, the sandwich bag of such a synthetic resin film with air vents may deteriorate the contents due to moisture penetration if stored for a long time (Utility Model Registration Publication No. 1985-1644), There is an air pocket somewhere in the interior, and during the process of transporting and storing it, the bursting by the drop impact (Utility Model Registration Publication No. 1996-7485) is a situation that has not been put to practical use. In addition, the more important problem is that they are difficult to separate and cannot be recycled, and they generate many environmental problems such as generation of toxic gases and difficult biodegradation, resulting in waste pollution.

Line technologies for solving such problems include Patent Registration Publication No. 1985-457 and Patent Publication No. 1999-73142. In Patent No. 1985-457, a printing ink capable of oxidative polymerization on a bag paper surface made of kraft paper is disclosed. It is applied as if it is printed on the target at intervals so as to be inclined at regular intervals, and then laminated with other bag paper to manufacture a bag for manufacturing bags. In Patent No. 1999-73142, a mesh made of PE yarn between two sheets of kraft paper Discloses a method for manufacturing a bag that is inclinedly reinforced using a water-soluble adhesive.

However, these line technologies have also improved the disadvantages of the prior art described above, but still suffer from the problem of deterioration and rupture of contents due to long-term storage, especially when packing with cement by air delivery. As air does not fall out, air pockets are generated and it is under weight. Also, the remaining air in the bag causes various problems such as deterioration (cement hardening) and rupture, replacing the current four ply kraft paper bag. The problem is that you can't. In addition, Utility Model Registration No.0251649 discloses cost-saving zones made of two or three plies by making two sheets of paper using water-based adhesives. It is not cost-cutting and difficult to put into practical use.

Therefore, the present inventors can use the corrugated corrugated cardboard, which is currently manufactured from recycled pulp, as an inlay of the kraft zone, which not only reduces manufacturing costs but also improves the properties of the zone, such as reducing the breaking rate, and also causes environmental pollution due to waste paper. Since the development of the heavy-duty packaging area to be reduced, it was filed in the Utility Model Registration No. 2001-27327.

This invention corresponds to the improvement of the said 27327 design. That is, the 27327 design is to achieve the purpose of the design by replacing the intermediate paper in the 3-4 ply kraft zone to the middle core, but in the present design by replacing the core core with a double bone core or triple bone core to replace the outer area or even the core core It is an improvement plan that made it possible.

The purpose of the present invention is to provide a zone of new construction.

Another object of the present invention is to increase the value added of the corrugated medium by using the corrugated medium can be used only for corrugated cardboard manufacturing.

Another object of the present invention is to provide a zone having safety and convenience that exceeds the conventional kraft paper in terms of performance and function by using a corrugated core with improved rigidity and support.

Another object of the present invention is to provide a new construction zone that contributes to resource recycling and reduces the pollution of environmental pollution by using the recycled paper core core as the zone fabric.

1 is a partial cutaway front view of the present invention 4-ply zone (Example 1).

1A is a cross-sectional view of the outer zone of FIG. 1.

Figure 2 is a partial cutaway front view of the present invention 3-ply zone (Example 2).

2A is a cross-sectional view of the outer zone of FIG. 2.

3 is a partial cutaway front view of the present invention 3-ply zone (Example 3).

3A is a cross-sectional view of the outer zone of FIG. 3.

4 is a partial cutaway front view of the present invention 4-ply zone (Example 4).

4A is a cross-sectional view of the zone from FIG. 4.

5 is a partial cutaway front view of the present invention 3-ply zone (Example 5).

5A is a cross-sectional view of the outer zone of FIG. 5.

6 is a partial cutaway front view of the present invention 4-ply zone (Example 6).

6A is a cross-sectional view of the outer zone of FIG. 6.

<Description of the symbols for the main parts of the drawings>

10, 20, 30, 40, 50, 60: Zone

11, 21, 31, 41, 51, 61: remote

12, 13, 22, 32, 42, 43, 52, 62, 63: Intermediate

14, 23, 33, 44, 53, 64: to

The fabric zone for the present invention zone is a corrugated medium prepared by containing 30% by weight or more of long fibers and multiple core cores coated with kraft paper on the surface of the core core.

Corrugated core used as the zone fabric of the present invention has a basis weight of 80-120 g / m 2, and the long fiber content ratio of the raw material is 30-100 wt%. That is, it is produced by mixing 30 to 100% by weight of long fiber pulp, which is made by collecting AOCC, which is composed of long fiber, in 0 to 70% by weight of short fiber pulp used as a pulp material by collecting recycled paper (KOCC). do. The average fiber length of a short fiber pulp is about 1.6 mm normally, and the average fiber length of a long fiber pulp is about 2.4 mm. It is also possible to add 0.5 to 2% by weight of known strength enhancers for strength reinforcement. Moreover, the softening agent, a polysol, starch, etc. which are physical property improving agents may be added as needed.

Thermal fracture length A (unit: km) of the multi-core core used in the present invention satisfies the following equation.

3.9≤1000T / (B × W) ≥5.9

In the formula, T: tensile strength (kgf), B: width of the test piece (15 mm), W: basis weight (g / ㎡).

Here, the term "thermal sheeting" refers to the length of paper at the point when the paper is cut from a certain length to the weight of the paper itself when the paper is hanged from a high place. The tensile strength of the paper is measured by the KS M7014 paper test method. Tensile strength (CD) of the fabric zone of the present invention is more than 7.1kgf / 15㎜.

Kraft paper ("KP") used in the present invention is produced by the known papermaking method by blending 100% by weight of virgin pulp or less than 20% by weight of long fiber paper in virgin pulp, B-class kraft paper (BKP) A paper made by mixing 10 to 20% by weight of virgin pulp with paper made of long fiber pulp and / or short fiber pulp, which is a lower quality kraft paper. The main use of the kraft paper is used as the base paper of the heavy packing area such as cement, sugar, flour, feed, etc., the main use of the grade B kraft paper is used for the skin of corrugated paper, sandwich paper of PP woven bag.

Corrugated paper normally used for corrugated cardboard is prepared by blending 70 to 100 wt% of short fiber pulp with 0 to 30 wt% of long fiber pulp as a raw material pulp.

In the present invention, the multi-layer paper used for manufacturing the zone is suitable for multi-layer paper having a thermal length of 3.9 to 5.9 km, preferably 4.3 to 5.2 km. If the thermal edge A of the core core is less than 3.9 km, the strength is too weak, so that the zone may be ruptured. If the thermal edge A has a thickness of more than 5.9 km, the thickness of the core core fabric is too thick, making it unsuitable for the zone fabric.

In the present invention, for the smooth appearance and vivid printing, the outer surface is kraft paper pulp raw material, and the inside is double corrugated paper and / or the outer surface is kraft paper, manufactured using a known method using the corrugated paper pulp material for corrugated cardboard, The inner corrugated core, the inner surface of the three core corrugated paper produced by the paper of the triple B-grade kraft paper is used as the outer paper and the outer paper of the zone. That is, the double corrugated paper is first sprinkled with the known kraft paper pulp on the wire of the paper machine, and then the paper is mixed with pulp of 0-30% by weight of short fiber pulp and 70-100% by weight of long fiber pulp. The core corrugated fabric is made, and the triple corrugated paper is first sprinkled with the known kraft paper pulp on the wire of the paper machine, and the mixed pulp of 30 to 100% by weight of short fiber pulp and 0 to 70% by weight of long fiber pulp is placed thereon. In addition, it is a corrugated medium prepared by sprinkling the B-grade kraft paper pulp thereon.

Corrugated paper made from recycled paper has been considered to be unable to be used for producing zones requiring strength because the fibers are mainly composed of short fibers. However, contrary to the concern that the use of a corrugated paper instead of kraft paper in the zone would cause a weakening due to its weak strength, there would be no problem in packing, transporting or storing the contents, but rather because of the thick and supportive characteristics of the corrugated paper. It is easier to maintain the angular form than the existing kraft paper, which is also easy to hold the contents, and less slip, there is a convenient to stack. On the other hand, kraft paper is good strength, but the rigidity is weak, after the goods are filled in the middle of the zone is bulging form, the phenomenon occurs to one side and fall when stacked on the ground.

As the strength enhancer used in the present invention, an epoxy strength enhancer such as KYMEN 5571 (trade name, Hercules Korea), FINEX-737 (trade name, Taekwang Chemical), etc. may be used as the strength enhancer commonly used in the paper industry. Stearmonium Hydroxypropyl Hydrolyzed: Coltide CQS (trade name, CRODA INC., USA), which may be used as an ammonia based intelligence enhancer.

According to the purpose of the present invention zone can be made of a variety of types of bar, the known finish type of sewing type is mainly used, depending on the contents may be used in the form of a sticky type of adhesive. In addition, each ply is cut in multiple stages and hot-melt-bonded so that not only the surface paper but also the inlay are attached to each other. It can be manufactured in well-known forms, such as an easy-open type that facilitates opening and closing, and a padded valve bag type that finishes in the form of a valve by applying a strip of kraft paper to an adhesive part. .

Another important factor in manufacturing the zone of the sewing leaf structure is the sewing process to seal the upper and lower openings of the zone. The sewing part refers to the part which is sewn with cotton thread by applying the creep tape and the Fila coat to the zone opening end.

Normally, cement is filled and filled with air bags at a pressure of 7 kg / cm 2 at the factory, where air is leaked through the stitching holes of the sewing part. However, if the needle stitch hole is too large or too smooth, cement dust is discharged together with air to contaminate the bag surface, and moisture may enter during storage or transport. Since the ground of kraft paper is basically a needle stitch hole, only one or two plies cannot prevent the release of cement dust. Kraft paper bags are usually used in three to four ply zones. If you use three to four ply zones, it is solid because it has several layers, but needle stitch holes overlap each other to prevent the release of dust.

The characteristics of the present zone, that is, the unique effect is that cement dust hardens and is discarded even after long-term storage, and the loss can be minimized as well as the reduction of cement dust generation which cannot be compared with the existing kraft zone. In the case of this design zone, the core is made of short fiber, and it has a certain thickness to make lint which can act as a filter around the stitches, and this lint serves as a filter that allows air to pass easily but prevents cement powder from escaping. Do it. In addition, when the zone is manufactured using the core core of the present invention, when the cement is filled in the zone, vortices occur in the zone to help the cement powder fall down and reduce dust generation.

In the sewing method of the present invention zone, needle 25 or 26 needles are used, and the number of needle stitches is 38 to 43, preferably 38 to 40 stitches for needle 25. Cotton yarn is sewn with 6 to 15 ply yarns, preferably 7 to 9 ply yarns, and the substitution of air and cement yields the best results.

Conventional kraft paper zones may cause dust or air pockets to cause underweight and rupture. Especially, if air remains inside the bag, the temperature when the cement leaves the cyclone and fills the bag is 70-80. Since the temperature is higher than the outside, condensation may occur due to a large temperature difference from the outside, which may cause cement to harden. In particular, thin and lack of flexibility, such as kraft paper may burst when the impact during loading, which may be caused by not only air pockets existing in the zone, but also air pockets existing between each ply. However, when using the core core, the core core is thick and flexible, so that the cushion does not occur, and thus no air pocket is generated. The action can absorb shocks and reduce the occurrence of breaks. In addition, the slip is also prevented to increase the stability, safety accidents can be reduced.

Hereinafter, the present invention will be described in detail with reference to Examples. This embodiment is not intended to limit the scope of the invention as an example to help understanding of the present invention. In this embodiment, the term "long fiber corrugated medium" refers to a corrugated medium made of only 100% by weight of long fiber solid paper pulp.

Example 1

Figures 1 and 1a is an embodiment of the present invention zone (4-ply), Figure 1 is a partial cutaway front view of the present invention zone 10, Figure 1a shows a cross-sectional view of the outer zone 11 of the present invention zone. The subject innovation zone 10 is the outer shell 11 is a double corrugated core, the middle paper 12, 13 is a corrugated core, to (14) is composed of a class B kraft paper. The intermediate paper 12 is a core made of 60% by weight of long fiber pulp and 40% by weight of short fiber pulp, the middle paper 13 is a core made of 80% by weight of long fiber pulp and 20% by weight of short fiber pulp. 11, the surface 11a is a kraft paper layer made of 100% by weight of virgin pulp, and the inlay 11b is a double corrugated paper made by laminating a corrugated layer made of 70% by weight of long fiber pulp and 30% by weight of short fiber pulp. . 14 to 14 are grade B kraft paper composed of 20% by weight of virgin pulp, 40% by weight of long fiber pulp, and 40% by weight of short fiber pulp, and reference numeral 4 denotes a sewing part.

Example 2

2 and 2a is an embodiment of the present invention zone (3-ply), Figure 2 is a partial cutaway front view of the present invention zone 20, Figure 2a shows a cross-sectional view of the outer zone 21 of the present invention zone. The outer shell 21 of the present invention zone 20 is a triple core, the middle paper 22 is a bone core, to (23) is composed of a long fiber bone core. The intermediate paper 22 is composed of 90% by weight of long fiber pulp and 10% by weight of short fiber pulp, and the outer body 21 is a kraft paper layer 21a of which 80% by weight of virgin pulp and 20% by weight of long fiber pulp. ), The inlay is a corrugated core layer 21b composed of 70% by weight of short fibers and 30% by weight of long fibers, and the inner surface is a triple class B kraft paper layer 21c composed of 10% by weight of virgin pulp and 90% by weight of long fiber. It is a triple core made by grass paper. 23 to 23 are long fiber cores composed of 100% by weight of long fiber pulp, and reference numeral 4 denotes a sewing portion.

Example 3

3 and 3a show another embodiment of the present invention zone (3-ply), FIG. 3 shows a partial cutaway front view of the present invention zone, and FIG. 3a shows a cross-sectional view of the present invention zone 31. The outer shell 31 of the present invention zone 30 is a triple bone core, the middle paper 32 is a bone core, and (33) is composed of the same triple bone core with the outer shell 31. The intermediate paper 32 is composed of 30% by weight of long fiber pulp and 70% by weight of short fiber pulp, the triple core wick is the kraft paper layer 31a of 100% by weight of virgin pulp, the inlay is 70% by weight of short fiber Corrugated core layer 31b composed of 30 wt% of long fibers, and the inner surface is a triple corrugated core made by laminating a long fiber corrugated layer 31c made of 100 wt% of long fiber pulp. Reference numeral 4 denotes a sewing part.

Example 4

4 and 4A show another embodiment of the present invention zone (4-ply), FIG. 4 shows a partial cutaway front view of the present invention zone 40, and FIG. 4A shows a cross-sectional view of the present invention zone to 44. The outer surface 41 of the present invention zone 40 is kraft paper, the middle paper (42, 43) is the core core, the to (44) is composed of a double core core. The outer paper 41 is a kraft paper consisting of 80% by weight of virgin pulp and 20% by weight of long fiber pulp, the middle paper 42 is a corrugated paper made of 60% by weight long fiber pulp and 40% by weight short fiber pulp, 43) is a corrugated medium consisting of 50% by weight long fiber pulp and 50% by weight short fiber pulp. From (44), the surface 44a is a kraft paper layer consisting of 80% by weight of virgin pulp and 20% by weight of long fiber pulp, and the inlay 44b is a corrugated layer of 80% by weight of long fiber pulp and 20% by weight of short fiber pulp. It is a double core made of double paper. Reference numeral 4 denotes a sewing part.

Example 5

5 and 5a show another embodiment of the present invention zone (3-ply), FIG. 5 shows a partial cutaway front view of the present invention zone 50, and FIG. 5a shows a cross-sectional view of the present invention zone 51. The outer shell 51 of the present invention zone 50 is a double corrugated core, the intermediate paper 52 is a reinforcement corrugated medium, the (53) is composed of kraft paper. The outer layer 51 is a surface 51a is a kraft paper layer consisting of 90% by weight of virgin pulp and 10% by weight of long fiber pulp, the inlay 51b is a corrugated layer of 70% by weight of long fiber pulp and 30% by weight of short fiber pulp. It is a double core made by double papermaking. Intermediate paper 52 is a reinforcement core made of 30% by weight of long fiber, 69% by weight of short fiber, 1% by weight of TOREZ P-1012 (trade name, Kukdo Chemical). Reference numeral 54 denotes kraft paper composed of 90% by weight of virgin pulp and 10% by weight of long fiber pulp, and reference numeral 4 denotes a sewing part.

Example 6

6 and 6a show another embodiment of the present invention zone (4-ply), FIG. 6 is a partial cutaway front view of the present invention zone 60, and FIG. 6a shows a cross-sectional view of the present invention zone 61. The outer shell 61 of the present invention zone 60 is a double core core, intermediate paper (62, 63) and (64) is composed of long fiber core core. The outer layer 61 is a kraft paper layer (61a) consisting of 80% by weight of virgin pulp and 20% by weight of long fiber pulp, the core is made of 80% by weight of long fiber pulp and 20% by weight of short fiber pulp core layer 61b It is a double core made by double papermaking. The intermediate sheets 62, 63 and 64 are long fiber cores made of 100% by weight of long fiber pulp. Reference numeral 4 denotes a sewing part.

Table 1 below shows the conventional kraft paper (based on basis weight 80g / ㎡) and the wave ratio of the present invention and the tensile strength and thermal shortening of the multi-layer paper (based on basis weight 110g / ㎡). Tensile strength is measured by KS M7014, and the stiffening rate is the rate at which the packing occurs from packing to loading the vehicle, and the occurrence rate of the sack when loading 1,325 bags in one truck is 600 for the cargo truck (18 tons). This is a measure of the rate at which the bag is loaded.

Example Rent Structure * Breakthrough rate (%) Tensile strength (kgf) Thermal insulation (km) Example 1 DP + MP + MP + BKP 0.4 7.9 4.78 Example 2 TP + MP + LMP 0.9 7.1 4.30 Example 3 TP + MP ⁺ + TP 0.6 7.7 4.66 Example 4 KP + MP + MP + DP 0.7 7.6 4.60 Example 5 DP + MP ⁺ + KP 0.8 7.4 4.48 Example 6 DP + LMP + LMP 0.5 7.3 4.42 Comparative Example 1 KP + KP + KP + KP 1.0 6.8 5.6

* KP: Kraft Paper

MP: Goal

MP ⁺ : bone core + intelligence enhancer

DP: double core

TP: Triple Goal

BKP: Class B Kraft Paper

As can be seen from Table 1, looking at the present invention zone has an effect that the wave ratio is improved than the conventional kraft paper (Comparative Example 1) zone.

In addition, the present invention zone has better properties than the net kraft zone in terms of physical properties, thereby improving loading stability or working environment, improving productivity, preventing resource recycling or environmental pollution, and reducing manufacturing costs.

Claims (5)

In the heavy pavement 3 to 4 ply zones, the 3 to 4 ply zone, characterized in that it contains the outer core or a multi-sheet that satisfies the thermal shortening formula below, the intermediate paper contains 1 to 2 ply core, 3.9≤1000T / (B × W) ≥5.9 In the formula, T: tensile strength (kgf), B: width of the test piece (15 mm), W: basis weight (g / ㎡). The zone according to claim 1, wherein the intermediate paper is composed of a corrugated paper prepared by mixing 0 to 70% by weight of high paper short fiber pulp and 30 to 100% by weight of long fiber pulp. The reinforcing agent according to claim 1, wherein the intermediate paper is prepared by combining 70-100 wt% of high paper short fiber pulp and 0-30 wt% of long fiber pulp with 0.5-2 wt% of an epoxy-based strength enhancer or a quaternary ammonium-based strength enhancer. Zone characterized by consisting of central locations. The zone of claim 1, wherein the outer surface of the multi-layer paper is a double corrugated paper fabricated from a corrugated paper layer composed of a kraft paper layer, and an inlay is made of 0-30 wt% of short fiber pulp and 70-100 wt% of long fiber pulp. . According to claim 1, wherein the multi-layered outer surface is a kraft paper layer, the inlay is a corrugated core layer made of 30 to 100% by weight short fiber pulp and 0 to 70% by weight long fiber pulp, the inner surface is produced by the paper grade B kraft paper layer Zone characterized by a triple core.